DB/Misc: Add XP for level up to 84

Source: www.wowwiki.com/Formulas:XP_To_Level

sql/updates/world/2011_11_24_02_world_player_xp_for_level.sql

@@ -0,0 +1,7 @@
+DELETE FROM `player_xp_for_level` WHERE `lvl` BETWEEN 80 AND 84;
+INSERT INTO `player_xp_for_level` (`lvl`, `xp_for_next_level`) VALUES
+(80, 1686300),
+(81, 2121500),
+(82, 4004000),
+(83, 5203400),
+(84, 9165100);